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If you do an experiment only once, you may make a mistake. So repeat your experiment to make sure you get the same results, and analyse your findings statistically to check they're significant. Then make any necessary changes to your hypothesis and conduct more experiments. Carefully record duplicate your work and check your conclusions. A hypothesis with lost of experimental evidence becomes a theory. A theory which has been confirmed many times is a scientific law. The great thing about hypotheses, theories and laws is that you can use them to make predictions. The law of gravity predicts that astronauts should float in space. And they do. Chemists and physicists, geologists and biologists, researchers in every laboratory in every field of research use the scientific method. They don't accept untested observations. So they don't believe that mud produces frogs.